function bp_messages_clear_cache_on_message_save( BP_Messages_Message $message ) {
	// Delete thread cache.
	wp_cache_delete( $message->thread_id, 'bp_messages_threads' );

	// Delete unread count for each recipient.
	foreach ( (array) $message->recipients as $recipient ) {
		wp_cache_delete( $recipient->user_id, 'bp_messages_unread_count' );
	}

	// Delete thread recipient cache.
	wp_cache_delete( 'thread_recipients_' . $message->thread_id, 'bp_messages' );
}